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tv is drawing too much current and protection circuit kicks on and shuts tv down. try turning all screen controls all the way down. if that doesnt fix it, sounds like bad green picture tube. suggest local service center

If the lamp has been replaced I would think the Lamp ballast would be most likliest followed by the color wheel and then the Digital board. You can get any part needed for your model at www.tvrepairworld.com just leave them a email they respond quickly.

t does sound like a bulb problem, either its over heating and shutting
off to protect itself, or its already shot. Give a TV repair shop a
call and see if they can give you an approximate price, then decide to
ditch or repair it.

When the Sony shuts down, the standby light shoulb be blinking a repeated count. Can you please post the model number and that count? The count will indicate the circuit that had a problem causing the set to shutdown.